Date of Award

12-1996

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. Ellsworth H. Shriver

Second Advisor

Dr. Aaron D. Byle

Third Advisor

Dr. David K. Peterson

Access Setting

Masters Thesis-Open Access

Abstract

The mam objective of this study was to investigate the effect of steam explosion pulping on the strength properties of recycled fibers. The properties considered were zerospan tensile strength, tensile breaking length, tensile stretch, tensile energy absorption, scott bond and pentosan content. This study also examined the important operating parameters that affect the properties. Laser printed waste paper was pulped by the steam explosion process. The experiments were statistically modeled to cover the various process variables. Chemical addition, residence time, pressure, and dispersant level were varied during the steam explosion experiments. Chemical addition was kept at four levels and other factors were kept at two levels. This was a mixed level full factorial design. Statistically it was not replicated.

Results indicated that the steam explosion process decreased the strength properties of recycled fiber when compared to unexploded pulp. Among the four factors studied, addition of NaOH showed significant effects on the strength properties.

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